Hand paint-spraying device.



No. 795,635. PATENTED JULY 25, 1905.

H. MIKOREY.

HAND PAINT SPRAYING DEVICE.

APPLICATION FILED DEG-17, 1904.

2 SHEETS-8113B! 1.

FIE.1.

my a cmlum u). l-vimum-annu-llm wuwnwu: c

PATENTED JULY 25, 1905. H. MIKOREY.

HAND PAINT SPRAYING DEVICE.- APPLICATION 11,121) DBO. n, 1904.

FiE.2-

2 SHEETS-SHEET 2.

n I. E MI? 1.4;:

- Emafifzbrey ANDREW l GRAHAM cu. nvmmmmmrm 1mm :1 c

.UNITED STATES PATENT OFFICE.

HANS MIKOREY, OF SCHONEBERG, NEAR BERLIN, GERMANY, ASSIGNOR TO THE FIRMOF W. GRAAFF & COMPANY, GESELLSOHAFT MIT BESCHRANKTER HAFTUNG, OFBERLIN, GERMANY.

Specification of Letters Patent.

Patented July 25, 1905.

Application filed December 17, 1904. Serial No. 237,222.

painting walls and floors and for decorative purposes generally.

The apparatus belongs to that known type of paint-sprayers in which-theaint passes out of a paint-reservoir to a nozz e and when flowing out ofthe latter is sprayed by the aircurrent of a compressed-alr pipe, whichair passes out of a second nozzle surrounding the first one.

As compared with the known apparatus of this type the novelty of thepresent invention consists in the special construction of thepaint-reservoir in so far as its wall on the outflow side is so inclinedthat it also permits the supply of the very last remaining portion ofpaint to the nozzle.

Another object of the invention is to provide means whereby compressedair can be supplied to the paint-reservoir for forcibly.

expelling the paint. This feature is specially adapted for paints of aviscous liquid nature, because in this case the flow of the paint doesnot take place with the desired certainty.

\ Finally, the invention comprises controlling mechanism which enablesthe operator to start the supply of compressed air to the nozzle at thesame time when the air-inlet to the reservoir is opened.

The inventlon is illustrated in the accompanying drawings.

Figure 1 represents the construction with a vertical paint-reservoir andwith a supply of compressed air thereto.' Fig. 2 represents theconstruction with a diiferently-arranged paint-reservoir for sprayingthe paint downward, and Fig. 3 is an end elevation of the constructionaccording to Fig. 2.

p The apparatus shown in Fig. 1 comprises the three features of theinvention. ervoir a of any suitable cross-sectional form is supported ina bracket 6, connected with a handle 1', which also serves as a casingfor a controlling-valve tube or cylinder t. The

bottom of the reservoir a is formed by an in- The res-- clined wall a,and has attached to its lower most end the paint-outflow tube 0, whichis controlled by a suitable cock is, and has its horizontal partterminating in the nozzle 6, where the supply of the compressed airtakes place. The compressed air is supplied through a valve-controlledpipe (I, communicating with an air-vessel u, from which passages lead tothe annular chamber w of the nozzle 6. A branch or auxiliary pipe 9 isbranched from the air-supply pipe (1 and passes through the deliveringpart of the pipe 0, terminating at the nozzle exit thereof. By thecombined action of the air-currents issuing from the annular chamber toand the inner tube 9 the paint is sprayed out of the nozzle in afinely-divided state. The reservoir is supplied with paint through aclosable filling-opening it. If the reservoir were hermetically closedafter it is filled, it is obvious that no paint could be delivered atthe outlettube 0. vided on the upper part of the reservoir, and thispipe Z passes from a port at the wall of the controlling-valve tube 25,which port is controlled by the annular grooved slidevalve piston p. Thelatter is connected by a rod f to a similar slide-valve g, which isarranged for controlling the supply of the compressed air to the pipe d..The combined slide-valves p and g are under the action of a spring y,tending to adjust the slide-valves in the cut-off position, as shown inFig. 1. The operator holding the handle in his hand can depress with thethumb the push-button 6, connected with the said slide-valve device.This arrangement enables the operator when opening the compressedairsupply to simul taneously open the air-inlet pipe Z, a suitable opening2 being provided for this purpose in the valve-controlling tube 15 as aninlet for the atmospheric air. By cutting 01f the air when the apparatusis not in use the paint is thus prevented from being deteriorated.Provided that paintof a higher degree of viscosity is to be employed inthe paint-reservoir, it is advantageous to apply pressureto' the paintcontained in the reservoir. For this purpose a pipe m extends from theair vessel u to the upper part of the reservoir. By opening a cock n inthis pipe m compressed air is admitted over the paint and the latter isforcibly expelled from the reser- An air-supply pipe Z is thereforeprovoir, assisting the delivery through the nozzle b. The inclined walla of the paint-reservoir a performs the function of collecting anddischarging the paint to the deliverypipe 0 and permits the very lastremaining portion of paint to be utilized no matter in what operativeposition the apparatus is held. The apparatus, according to Fig. 1,.

is chiefly adapted for spraying in a horizontal or downward direction.

The modified construction, according to Figs. 2 and 3, is chieflydestined for spraying downward'for instance, for painting floors. Itcomprises the paint-reservoir a, which in this case is arrangedhorizontally and has the removable lid h; further, thecompressed-airsupply pipe (1, the paint-delivery pipe 0, terminating inthe nozzle 1), the air vessel u, which communicates with the annularnozzle-chamber w, and, finally, the handle 7". The latter is shaped inthe form of a yoke, and the operator when holding the apparatus by meansof this handle can at the same time depress the push-button c with histhumb. The said push-button e controls the opening or closing of aflexible tube'o, forming an intermediate part of thecompressed-air-supply pipe (1. A spring 3 tends to keep the push-buttonin that position in which the supply is cut off. It is obvious that thisarrangement enables a similar operation to that according to Fig. l. Thepaint-reservoir has the inclined wall at its front end? 'i. e., at thatend where the outflow-pi e c communicates-and this wall extends om thebottom obliquely toward the said outflow, as shown in Fig. 2. By thisarrangement the supply of the paint to the nozzle is effected as soon asthe apparatus is tilted downwardly, the paint then flowing along theinclined wall which delivers all the paint to the nozzle. Thecutting-off device referred to in connection with the push-button e canbe constructed with a throttle-valve or the like, so that by operatingthe pushbutton the supply can be regulated at will.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim, and wish to secure by Letters Patent, is

1. A hand paint-spraying device consisting of a closed paint-reservoir,a nozzle leading therefrom, a pipe for supplying compressed air to saidnozzle, a pipe for supplying air at atmospheric pressure to thereservoir above the paint therein and a device for simultaneouslycontrolling the supply of atmospheric air to the reservoir andcompressed air to the nozzle, substantially as described.

2. A hand paint-spraying device consisting of a closed paint-reservoir,a nozzle leading therefrom, means for supplying said nozzle withcompressed air, a connection from said means to the top of the reservoirfor delivering compressed air to the reservoir above the paint, a pipefor supplying atmospheric air to the reservoir above the paint and meansfor simultaneously controlling the supply of compressed air to thenozzle and of atmospheric air to the reservoir, substantially asdescribed.

3. In a hand paint-spraying device 0 erated by a compressed-airspraying-nozz e, a horizontally-arranged paint-reservoir having aninclined wall extending to the delivery-outlet and so arranged that bytilting the apparatus, the supply of paint can be regulated,substantially as described and shown in the drawings.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HANS MIKOREY.

Witnesses HENRY HAsPER, WOLDEMAR HAUPT.

